Measurement of neutrino oscillation by the K2K experiment
- M. H. Ahn
- E. Aliu
- S. Andringa
- S. Aoki
- Yuya Aoyama
- J. Argyriades
- Ken Asakura
- R. Ashie
- F. Berghaus
- H. Berns
- Hyoung Chan Bhang
- A. Blondel
- S. Borghi
- Jacques Bouchez
- S. C. Boyd
- J. Burguet–Castell
- D. Casper
- J. Catala
- C. Cavata
- A. Cervera
- S. M. Chen
- K. O. Cho
- J. H. Choi
- U. Dore
- S. Echigo
- X. Espinal Curull
- M. Fechner
- Enrique Fernandez
- K. Fujii
- Y. Fujii
- Satoshi Fukuda
- Y. Fukuda
- Juan José Gómez-Cadenas
- Richard Gran
- T. Hara
- M. Hasegawa
- T. Hasegawa
- K. Hayashi
- Y. Hayato
- R. L. Helmer
- I. Higuchi
- J. Hill
- K. Hiraide
- E. Hirose
- J. Hosaka
- Atsuko K Ichikawa
- M. Ieiri
- M. Iinuma
- Akihiro Ikeda
- T. Inagaki
- T. Ishida
- K. Ishihara
- H. Ishii
- T. Ishii
- H. Ishino
- M. Ishitsuka
- Y. Itow
- T. Iwashita
- H. I. Jang
- J. S. Jang
- E. J. Jeon
- I. S. Jeong
- K. K. Joo
- G. Jover
- Chang Kee Jung
- T. Kajita
- J. Kameda
- K. Kaneyuki
- B. H. Kang
- I. Kato
- Y. Kato
- E. Kearns
- D. Kerr
- C. O. Kim
- M. Khabibullin
- A. Khotjantsev
- D. Kiełczewska
- B. J. Kim
- H. I. Kim
- J. H. Kim
- J. Y. Kim
- S. B. Kim
- M. Kitamura
- P. Kitching
- Kazuyoshi Kobayashi
- T. Kobayashi
- M. Kohama
- A. Konaka
- Y. Koshio
- W. Kropp
- Jun Kubota
- Y. Kudenko
- G. Kume
- Yoshitaka Kuno
- Yoshinori Kurimoto
- T. Kutter
- J. G. Learned
- S. Likhoded
- I. T. Lim
- Sung Hak Lim
- STStephane T'Jampens
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 2006 · American Physical Society
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Abstract
We present measurements of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ disappearance in K2K, the KEK to Kamioka long-baseline neutrino oscillation experiment. One-hundred and twelve beam-originated neutrino events are observed in the fiducial volume of Super-Kamiokande with an expectation of ${158.1}_{\ensuremath{-}8.6}^{+9.2}$ events without oscillation. A distortion of the energy spectrum is also seen in 58 single-ring muonlike events with reconstructed energies. The probability that the observations are explained by the expectation for no neutrino oscillation is 0.0015% ($4.3\ensuremath{\sigma}$). In a two-flavor oscillation scenario, the allowed $\ensuremath{\Delta}{m}^{2}$ region at ${sin}^{2}2\ensuremath{\theta}=1$ is between 1.9 and $3.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\text{ }\text{ }{\mathrm{eV}}^{2}$ at the 90% C.L. with a best-fit value of $2.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\text{ }\text{ }{\mathrm{eV}}^{2}$.